Puppet-valve for engines.



. S. ROSENZWEIG.

PUPPET VALVE FOR ENGINES.

APPLICATION FILED IIILYS. Isle.

1,198,279. v Pantedsept. 12,1916.

gwuml foz SIEGFBIED ROSENZWEIG, 0F NEW YORK, N. Y.

PUPPET-VALVE FOR ENGINES.

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Specification of Letters Patent.

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lApplication ined July 3, 191s. serial No. 107,372.

To all whom it may concern:

Be it known that I, SIEGFRIED RosriN- zwErG, a citizen of the United States, residling in New York cityfin the county and y State of New Yorin, have invented-a new and useful mprovement in Puppet-Valves for Engines, of which the following is a specification.

My invention relates to a double or twoseated valve of the expanding type, that is to say a two-seated puppet valve in which one of the two valves, or .that portion of the same which carries the valve seat, is capable of slight movement to and from the other in order to compensate for any difference in expansion between the two-seated valve and the corresponding cylinder or steam chest seats which co, act with the valve seats. puppet valves of this general kind are old and public property.

My invention relates more particularly to a two-seated valve in which the valve body is of the well known hollow constructionito permit the steam which passes out aroundl the lower seat to pass thereto down through the interior of the valve body, which is made hollow for this purpose. A one piece double-seated puppet valve of this kind is represented in my Patent No. 1,125,724 of January 19, 1915.

It is the object of myl invention to combine in a valve of this kind the attributes of an expanding valve and a .relief valve; and to make it practically a balanced valve aswell. And to this end my invention consists of a certain construction, combination and arrangement of the component parts of the valve which will irst be described in connection with the accompanying drawing forming part of this speciiication, and will then be more particularly pointed out in the claim.

The drawing represents in axial section a valve embodying my invention, together with so much of the steam chest and cylinder of the engine as needed for the purposes of explanation.

I have omitted from the drawing, as unnecessary to an understanding of my invention, the valve operating gear, and also the valve spindle spring (shown for example in my Patent No. 1,125,724) for drawing the double valve in a direction to close it against its seats in the steam chest- Which seats for brevitys sake I shall term cylinder Double-seated seats, in contradistinction to the coacting seats on the double valve-which I shall term valve seats. p

In the drawing A is the cylinder, B the steam chest, usually cast in one with the cylinder, e the cylinder steam inlet port.

v The valve, as shown, is, in general terms, a

double-seatedpuppet valve with a hollow body whose walls are concavo-convex in longitudinal section, approximating a spool in contour, with annular seats at opposite ends of the body, which are adapted to rest against and engage the annular cylinder seats c, c in steam chest B. The course of the entering steam from the steam chest to the cylinder through the double valve and cylinder inlet port e is indicated bythe arrows.

The double-valve consists of two halves or sections, the one movable lengthwise with relation to the other to vary the distance between their seats. The lower section is an integral casting comprising the tubular hub F, the annular rim Gand' the means H for connecting the two, which means may be radial spiders, or a stout web in which holes are formed to admit steam below the same. The hub F its'and slides upon a tubular bearing or guide a: in the steam chest for the valve spindle fw, and is rigidly secured to the projecting outer end of the latter by an internal annular flange f which rests upon a collar g on the valve l spindle, and is pressed tight down on the same by a nut h and washer h on the screw threaded extremity of the spindle. The hub F and itsV attached parts G, H,'thus are rigidly connected to, and must move with, the valve spindle. rlhe rim G has the seat o on its lower face (or rear face.

relatively to the movement of the steam through the hollow valve body), and it has also at its outer edge, and projecting above its upper face, a peripheral upright flange e', the purpose of which will be presently described. The upper half or section of the valve is also an integral casting comprising a rim I which overhangs the cylinder seat o and bears on its annular under face or edge the valve seat o to coperate with said cylinder seat c, said rim merging into the concavo-conveX hollow portion K forming the hollow, externally recessed or concave. valve body which extends between the upper and lower rims of the double valve. said body terminating at its lower end in a ring Z of smooth cylindrical periphery to fit into, and against the inner face of, the

flange 'e'. on the lower valve section and make K to a hub M, which fits and can slide on the hub F of the lower valve section.

Normally there is ay certain clearance space or interval s between the abutting ends of the two valve sections, which may be greater or less as desired, and is provided for by putting the two cylinder` seats c, c at a distance apart greater than that which separates the two valve seats o, c', so that the two valve sections must separate or slide apart a-certain distance before both can be properly seated. In this way the two valve sections are free to slide upon one another to increase or decrease the distance between their seats, as circumstances may require. A spring n interposed between the upper end of the hub M and the washer 7L on the valve spindle, may be, and

preferably should be, employed, to bear upon the upper valve section in a direction to close it down on thevlower valve section. This spring, however, is designed to act more as an elastic stop than anything else,

land should be a light spring of slight tension.

It will be noted that the pressure of the steam in the steam chest upon the area p-r of the valve tends to keep the valve closed. But in my two part valve, another and additional unbalanced area pkg is added to the valve on the steam cylinder side of the valve, the side opposite that on which lies the area 2)-7- upon which the pressure of the steam entering the steam chest is exerted. The area p-g is on the cylinder side of the same valve section as that on which the area p-r is provided-in this instance the upper valve section; and it is so located that the steam cylinder pressure will operate thereon in opposition to the pressure exerted by the entering steam on the area 7?*r on the other face of said section.

In the particular illustration given, the area 7)-r is practically twice the area p-g, in which case the steam cylinder pressure must be at least twice as great as that of the steam on the steam chest in order to open the valve and thus relieve the cylinder pressure. lt is, however, apparent that by shifting the diameter D closer to or farther from the diameter g, or, in other words, by vary-- ing the areas 1Q- 7' and pkg relatively to one another, the valve can be made to open and thus operate as a relief valve at any den sired cylinder pressure.

It will be noted that, in thus operating the valve as a relief valve, only the upper valve section is lifted. In this way the cylinder pressure, to insure the opening of the valve, has to overcome the opposed pressure on the unbalanced area p-r only (the extremely slight pressure of the light spring n being negligible), and not that pressure plus the opposing pressure of the main valvestem-closing spring, which would be the case were the two valve sections lifted together as a whole.

i My two-seated sectional hollow puppet yalve, not only is an expanding valve and a relief Valve, but is a balanced valve as well.

Aswill be seen by reference to the drawing, the lower valve section is balanced save for pressure, whether from the steam chest side` or cylinder side, von certain limited areas, which is negligible. When the valve gear starts to open the valve, it lifts the valve stem and consequentlythe lower valve section which is rigidly secured to it. But owing to the clearance space or interval s between the abutting ends of the two valve sections, the ,upper valve section remains at rest on its cylinder seat c and will thus remain closed until the lower section has traversed this interval and engaged` the upper section, which only then partakes of the movement of the lower section. But before this takes place, and while traversing this interval, the lower section has been raised high enough to lift its seat /U from the corresponding cylinder seat c, thus providing an opening between the two to permit steam passing down through the hollow body of the Valve to pass to the cylinder side of thevalve, thereby equalizing the pressure above and below the valve by the time the upper valve section begins to be lifted by the lowersection.

It will be understood that the -terms upper and lower as applied to the valve sections and valve seats are purely relativethe term lower valve seat intending the seat-in this instance the seat ohto reach which the entering steam must first pass through the hollow valve body, and the term upper valve seat intendingthe other seatin this instance the valve seat c.

Having described my improvement and the best way now known to me of carrying the saine into practical effect, l state in conclusion that l do not limit myself narrowly to the structural details hereinbefore shown and described in illustration of vmy invention, since manifestly the same can be varied in a number of particulars without departure from the spirit of the invention; but

ift/*hat l claim herein as new and desire to secure by Letterslatent is as follower fr tw -sea'ted puppet engine sec 'ons-a lower section cc and with a peripheral upright flange projecting above its upper face, a hub rigidly fastened to the valve spindle, and connecting means between said 'rim and hub; and. an upper section carrying the other valve seat and capable of sliding movement relatively to the lower section to permit the distance between the valve seats carried by the two sections to vary, comprising an externally -recessed or concave hollow body, open internally from end to end, an annular valve scat at its top, and an annular lower end closely fitting againstv and having slidingl connection with the peripheral flange on the rim of the lower section, a hub slidably mounted with reference to theflower section and connecting means between said hollow body and hub-said hollow body having on its exterior face an unbalanced area against which steam pressure from the engine cylinder may act in opposition to the steam pressure exerted on the opposite face of said body, substantially as and for the purposes hereinbefore set forth.

In testimony whereof I aiix my signature.

SIEGFRIED ROSENZWEIG. 

